Witnesses say a U.S. Army veteran charged at the gunman to save lives.\r<br>\r<br>Witnesses say a U.S. Army veteran charged at the gunman to save lives. Once again theres been a tragic shooting at a school in the US. Chris Harper Mercer .\r<br>\r<br>Among those injured when gunman Chris Harper Mercer opened fire at a community college in Oregon was an army veteran who has been praised as a hero .
